9p_link.c

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/*
 * vim:expandtab:shiftwidth=8:tabstop=8:
 *
 * Copyright CEA/DAM/DIF  (2011)
 * contributeur : Philippe DENIEL   philippe.deniel@cea.fr
 *                Thomas LEIBOVICI  thomas.leibovici@cea.fr
 *
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * ---------------------------------------
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#ifdef _SOLARIS
#include "solaris_port.h"
#endif

#include <stdio.h>
#include <string.h>
#include <pthread.h>
#include <sys/stat.h>
#include "nfs_core.h"
#include "log.h"
#include "cache_inode.h"
#include "fsal.h"
#include "9p.h"

int _9p_link( _9p_request_data_t * preq9p, 
                  void  * pworker_data,
                  u32 * plenout, 
                  char * preply)
{
  char * cursor = preq9p->_9pmsg + _9P_HDR_SIZE + _9P_TYPE_SIZE ;

  u16 * msgtag = NULL ;
  u32 * dfid    = NULL ;
  u32 * targetfid = NULL ;
  u16  * name_len = NULL ;
  char * name_str = NULL ;

  _9p_fid_t * pdfid = NULL ;
  _9p_fid_t * ptargetfid = NULL ;

  fsal_attrib_list_t    fsalattr ;
  cache_inode_status_t  cache_status ;
  fsal_name_t           link_name ;


  if ( !preq9p || !pworker_data || !plenout || !preply )
   return -1 ;

  /* Get data */
  _9p_getptr( cursor, msgtag, u16 ) ; 

  _9p_getptr( cursor, dfid,    u32 ) ; 
  _9p_getptr( cursor, targetfid,    u32 ) ; 
  _9p_getstr( cursor, name_len, name_str ) ;

  LogDebug( COMPONENT_9P, "TLINK: tag=%u dfid=%u targetfid=%u name=%.*s",
            (u32)*msgtag, *dfid, *targetfid, *name_len, name_str ) ;

  if( *dfid >= _9P_FID_PER_CONN )
   return  _9p_rerror( preq9p, msgtag, ERANGE, plenout, preply ) ;

   pdfid = &preq9p->pconn->fids[*dfid] ;

  if( *targetfid >= _9P_FID_PER_CONN )
   return  _9p_rerror( preq9p, msgtag, ERANGE, plenout, preply ) ;

   ptargetfid = &preq9p->pconn->fids[*targetfid] ;

   /* Let's do the job */
   snprintf( link_name.name, FSAL_MAX_NAME_LEN, "%.*s", *name_len, name_str ) ;
   link_name.len = *name_len +1 ;

   if( cache_inode_link( ptargetfid->pentry,
                         pdfid->pentry,
                         &link_name,
                         &fsalattr,
                         &pdfid->fsal_op_context,
                         &cache_status) != CACHE_INODE_SUCCESS )
     return  _9p_rerror( preq9p, msgtag, _9p_tools_errno( cache_status ), plenout, preply ) ;

 
   /* Build the reply */
  _9p_setinitptr( cursor, preply, _9P_RLINK ) ;
  _9p_setptr( cursor, msgtag, u16 ) ;

  _9p_setendptr( cursor, preply ) ;
  _9p_checkbound( cursor, preply, plenout ) ;

  LogDebug( COMPONENT_9P, "TLINK: tag=%u dfid=%u targetfid=%u name=%.*s",
            (u32)*msgtag, *dfid, *targetfid, *name_len, name_str ) ;

  return 1 ;
}